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Fan-games
Role-playing Games
These games use the same basic mechanics and structure as UNDERTALE. It ain't broke, so why fix it, right?
Underswap by Team Switched
Underswap, one of the fandom's earliest AUs, remains one of its most popular as well. This time, Team Switched has totally reimagined the Underground and its inhabitants. It barely resembles the official Underswap at all... And we're all better for it.
Characters maintain their canon personalities. It's only their roles and orders of appearance that have been switched up. Thankfully, we still meet Sans in the second area! I don't think I could've waited any longer. But this Sans... oh God he's just perfect. He's worth any wait.
TS perfectly reproduces Sans's sense of humour, Epicurean attitude, and duality. I never imagined someone could make a convincing Super Hero Sans AU, but wow. Here we are. YOU ALSO GET TO HANG OUT WITH HIM!!!! And that whole sequence is hilarious and revealing and heartwarming. After completing it, I didn't SAVE because I knew I'd want to play through it again. I loved his battle too, even though he kicked my ass. It was fun!
TS!Underswap is still in development but it is already surprisingly complex and fascinating. Sans's section is complete. You can enjoy a whole narrative arc with him. Please give this game a try because wow yeah it's amazing.
Outertale by Project Spacetime
I haven't played this one yet...!!! But I heard it's really good.
Hopefully Sans is as cute and funny as always.
DUSTTALE: I MISS YOU
Call me a fake Sans fan for getting invested in an AU that eschews all his morals, but I love DUSTTALE. There are lots of great games dedicated to this AU... I could rant about IDUTSHANE for longer than the game's entire run time. But it feels too niche to recommend. I think Stretch's updated take is the most accessible and the most fun.
I haven't played it yet! I want to try it soon.
Visual Novels
Right now, Dating Start! is the only Sans-related visual novel that I can endorse. I haven't played Bonely Hearts Club or any of the other AU Crossover ones... I need to double check that, at the very least, they get Classic Sans right!
Dating Start! by DerpyChoCho
An absolutely delightful Sans dating sim. It faithfully recreates Undertale's atmosphere and humour. The character voices are strong, especially the ensemble cast. Our romantic moments with Sans... ahh, my heart flutters at the memory. If you have even the slightest romantic interest in Sans, please play this game! It's funny, charming, and full of soul.
I love Sans so much... I wanna be close to him. I wanna play this game again and write a full review.
DerpyChoCho made another game where Sans flirts with you. Sadly, it's only an April Fool's Day joke. It's very short, but I'm still grateful it exists. It always makes me laugh and... y'know. Feel some type of way.
Multiplayer Games
Do you have friends who love Sans just as much as you do? Awesome!!! Try playing these games together for a good time.
UNDERTALE Last Corridor
Imma be real with you: I have no idea what this is! I was a Minecraft kid. I've never played Roblox, much less this niche UNDERTALE fan-game. But UTLC must be popular for a reason (perchance... it's good?!) and I'm sure at least one person reading is glad that I linked to it.
Super Smash Brothers
Sans is officially in Smash Ultimate, but only as a Mii Fighter. If you want to play as Sans with a full moveset, check out these mods for Smash Ultimate and Brawl.
Miscellaneous Genres
This section is for games that break the mould, or games that are just gags.
Friday Night Funkin' Mods
There's a huge overlap in FNF and UT fans. if I knew more about FNF i'm sure i could tell you why. My guess is that both games are colourful, rewarding, and emphasise music. I'd give anything for an Undertale rhythm game... I mean, many crossovers exist. I'm just not good at any of them LOL— FNF included. That's why my recommendations for these mods may be outdated... But yeah. Here are some things I saw that I liked.
Sansgotchi
Care for your virtual pet, Sans Undertale, in a cute little app. If I had an Android phone, I think I'd be playing this all the time... But i'm iPhone-bound. Sad. Anyways, you get to spend time with mini Sans. Feed him, sing with him, and decorate his room. The mini games gave me a challenge— again, probably because I'm not playing on the intended device. Overall, the game is a bit of a grind, but your love for Sans should fuel you, right?? I'm interested to see how his dialogue changes as his relationship with the player develops. He starts out not expecting much from us... Can we really become friends?
I want to play this game more!!! Ahh, I'm sad...
Sans but JoJo Poses
I don't know why this exists... but I'm so glad that it does.
Honourable Mentions
Games that don't feature Sans heavily— or at all— but are still cool/fun/worth your time.